Probability

Rules of a table tennis match are :
(1) Whoever wins 4 sets before the other wins 3 sets wins the match.
(2) If deuce ( 3 to 3), the match continues until the one who first wins 2 sets more than his opponent will win.
Probability that Sam winning a set = 0.6. Find :
(a) Probability that Sam wins the match.
(b) Probability that his opponent, Pat, wins 2 sets if Sam wins the match.